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Cyclones and Anti-cyclones

The Earth's spin causes the wind to curve. This is called the
Coriolis Effect. The wind in the northern hemisphere curves to the right
and the wind in the southern hemisphere curves to the left.
When the wind swirls counter-clockwise in the northern hemisphere or
clockwise in the southern hemisphere, it is called cyclonic
flow. When the wind swirls clockwise in the northern hemisphere
or counter-clockwise in the southern hemisphere, it is called
anticyclonic flow. An example of cyclonic flow is the
flow around a low pressure area while an example of anticyclonic flow is
the flow around a high pressure area. A hurricane is a cyclone.

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